Capture and share with the community, a Wireshark trace on the SPA8000's subnet. This way we'll be able to analyze what is being sent to and from the SPA8000 in addition to the debug log information which can easily be viewed with Wireshark [so no need for a syslog server]

Please consider following this sequence of steps:

Start the Wireshark trace on the SPA8000's subnet

Reboot the SPA8000 so that its boot process, registration, and debug messages are captured by Wireshark

Replicate the problem/s, taking careful note of either time of day or packet frame number.These notes, if accurate will help speed up analysis of the trace.